| 摘要 |
PROBLEM TO BE SOLVED: To provide a steel belt having an inexpensive steel composition free from a large quantity of alloy elements unlike maraging steel, exhibiting high strength and moreover free from welding defects and to provide its producing method. SOLUTION: This steel belt obtained by welding a hoop into a ring shape and thereafter performing heat treatment has a composition in which each content of C, Si, Mn, Cr, Mo and V is prescribed and moreover the relation in the following inequality (1) is satisfied, has a metallic structure essentially consisting of tempered martensite, has high strength and is free from welding defects, and the method for producing the steel belt is also presented: 215[Si]+110[Cr]+-115[Mo]+114[V]>=400...(1) (wherein, [ ] denotes the content (mass%) of each element).
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